We, the ISG Personnel Management GmbH, are one of the leading HR Management companies in Europe. As a full service provider, we covering all areas of human resources. It´s our ambition to link people and companies, promoting their strengths and contributing to their success. We actively work for our customers with a team of more than 550 people at more than 50 locations in 25 countries around the globe. On behalf of a fast growing international E-Commerce customer, specialized in SEA technology and offices in Berlin, London and Passau we offer you the following very attractive position. Senior Ruby Developer (m/w) - BerlinYour responsibilities

Joint responsibility for the development of the technical platform and significant involvement in the architecture and choice of tools and technologies used

Develop and test new features in pair programming with colleagues

Work on improving our software algorithms

Ensuring that the campaign and bid tool runs quickly and reliably even with billions of data sets

Your profile

Very good knowledge of Ruby and Rails, speak perfectly Ruby

Professional experience with SOA and MVC architectures

Agile mind-set and TDD and CI

Considering RESTful Web services with JSON the better form of communication

Experience in dealing with relational and NoSQL databases

Excellent analytical skills

Speaking fluently English and German

Understanding Linux / Unix System operations and knowledge in the field of SEM